Saturday
April 19, 2014

Homework Help: Chem >Jai

Posted by Connie on Saturday, September 10, 2011 at 4:49pm.

Posted by Connie on Saturday, September 10, 2011 at 10:36am.

What is the amount of energy of calories to heat 8.5g of water from 15 C to 36 C?

I think you take 8.5g x 21 degree C, but then I am stuck. Thank you

Chem - Jai, Saturday, September 10, 2011 at 10:50am

amount of energy absorbed or released is given by
Q = mc*(T2 - T1)
where
Q = heat (in Joules)
m = mass (in grams)
c = specific heat capacity (J/g-K)
T = temperature (in Celsius or Kelvin)
*note that Q is (+) if the object absorbed heat, and (-) if it released heat.
for water, c = 4.184 J/g-K (you can find this in books or you can google this)
substituting,
Q = 8.5*4.184*(36-15)
Q = ?
now solve for Q. units in Joules.

hope this helps~ :)
First, thank you, I get 746.844J but my book says the answer is 180 cal---what am I not doing correctly?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

English - Posted by rfvv on Saturday, September 25, 2010 at 9:16am. 1. Yesterday...
Random Question - Posted by Alex on Saturday, June 4, 2011 at 12:55pm. Based on ...
General-English - Posted by angie on Sunday, September 25, 2011 at 4:48pm. Is ...
chemistry - Just wanted to say thank you to DrBob for responding back even if he...
math - Posted by kathy on Monday, September 26, 2011 at 8:05pm. 1.the square og ...
English-help needed - I also thought that both are acceptable. However, I am ...
Math repost for jet - Posted by Jet on Saturday, September 29, 2007 at 2:01pm. ...
pre-calc Question on a previous question - On the question below, Bob Pursley ...
Algebra II - I need to write a polynomial in SIMPLEST FORM having roots 2,-2 and...
algebra 2 - Posted by hellogoodbie on Saturday, January 16, 2010 at 3:24pm. ...

Search
Members